Doubt 2:
As far as I can remember,there is some info about alum is one of resonance’s modules. Something about conditions for a salt to be an alum. If someone can post that page or any other source where this information is present, it would be great. Thanks

@Supreeta_Sen
Its a point to be remembered that in Diborane only a maximum of the four planar B-H bonds can be methylated . In other words the bridge bonds cant be replaced by methyl group.
PS: Called the methylation experiment for diborane.

No, you know how there are 2 metal cations in an alum, right? It’s like it’s mandatory that one of them is a monovalent metal, the other trivalent. I only remember seeing this. Wanted to know if there are any other such rules.